Praxis Works
Conversion Bottom Bracket for Shimano Cranks

This item is available for FREE Home Delivery (Bikes over $499) in the Greater Bay Area and Sacramento Region or it can be picked up at any Mike's Bikes. Choose your preferred option and when the order is ready, our cycling experts will contact you to arrange delivery or pickup.

Details

NOT AN ADAPTOR: Our industry leading conversion BB is a full proper bottom bracket for installing either Shimano™, SRAM GXP, or Campy Ultra Torque cranks in either BB30, PF30, or Specialized’s OSBB frames. Our patent pending design keeps the cartridge bearings outboard of the frame right on spec for greater rigidity and free of frame/c-clip tolerance issues that other systems deal with. Simply press in the longer Non Drive Cup, then the shorter drive cup threads into it. As the Drive cup threads in, our trademark Praxis Collet system expands to a precise machined limit evenly dispersing pressure for a super tight fit.

With both cups connected and our collet set exactly to spec, there is no chance the bearings can come out of alignment or walk out of the frame. This design also uses a compressible o-ring on the non-drive side cup to compensate for frame shell width discrepancies.